Radiator



June 7,1932. THE. MURRAY, JR

RADIATOR Filed Dec. '7, 1929 anoento'c 72 01/45 E M/RRW) Jr? flame/1 Patented .lune 7, 1932 UNITED STATES PATENT OFFICE THOMAS E. MURRAY, J'BQOI' BROOKLYN, NEW YORK, ASSIGNOB, BY ASSIGN- MENTS, TO AMERICAN RADIATOR & STANDARD SANITARY CORPORATION .A. COR- PORATION' OF DELAWARE Application filed December 7, 1829. Serial No. 412,317.

My invention aims to provide a radiator of the convection type in which the parts are made of metals especially adapted to serve certain advantages hereinafter referred to.

The construction illustrated is that of a radiator of the Murray type, described in several previous applications of myself and others.

Fig. 1 is a perspective view of the complete radiator;

Fig. 2 is an elevation of one end;

Fig. 3 is a horizontal section;

Fig. 4 is a section on the line 44 of Fi 2;

I ig. 5 is a similar section of a modification.

A tube 1 for steam, hot water or other heating medium is bent backward and forward to form several lengths in the same vertical plane. It is embraced between an eX- tended area structure consisting of corrugated sheets which form transverse fins 2 connected alternately at their outer ends by longitudinal plates 3 and at their inner ends by longitudinal plates 4. The inner portions of the corrugations are recessed as at 5, Fig. 4, to embrace the tube 1 and are fastened thereon by means of straps 6 also formed with recesses 7 embracing the tube. The 0pposite straps are welded together as indicated at 8 through holes in the inner portions 4 of the corrugations to firmly unite the parts together and to establish a close heat conducting contact between the tube and the fins or corrugated sheets.

Sometimes a corrugated sheet is applied to only one side of the tube as indicated in Fig. 5. In that case the straps 6 at opposite sides of the tube embrace only a single thickness of metal ilbetween them.

The'ztube 1. is made of very thin copper or other cuprousmetal. such for example as alloys composed chiefly of copper. This has advantages in rapid transference of heat to the fins. It has an advantage also in making a continuous bent tube of the form illustratcd, though the invention is applicable to radiators using separate lengths of tubing or even a single length of tubing.

By reason of the further construction hereinafter described, the copper tube can be made extremely thin so as to reduce its weight to a minimum.

The corrugated sheets are preferably made of aluminum or similar aluminous material, such for example as alloys composed chiefly of aluminum.

This metal has the great advantage of lightness as compared with copper which has been generally used in this type of radiators,

and is nearly as good a heat conductor as copper.

The straps 6 are of steel or iron or similar ferrous metal. This metal has the advantage of stiffness to such a degree as to permit the use of extremely thin flexible metal for the tube and the corrugated sheets. Steel has also a great advantage over aluminum in point of capability of welding. The welding is performed in the manner described in the previous application to George H. Phelps, Serial No. 249,538 filed January'26,

1928. That is, the two opposite straps are ward draft of the heated air and causes it.

to circulate rapidly throughout the room to be heated. Or it may be used for cooling the air of a room by circulating cold brine or similar medium through the tubing. It works with such a high efficiency compared with the ordinary cast iron radiators that for a given heating effect it can be made very much smaller and thus considerably economize space.

The difference in size is so great that even when using tubing and corrugated sheets of copper the complete radiator is lighter than a cast iron radiator for similar duty. The 100 met and straps on the outside of portions of e fins at opposite sides of the heating element fastened together so as to hold the fins in contact with the heating element, said straps'being of ferrous metal fastened to each other by welded connections.

In witness whereof, I have hereunto signed my name.

- THOMAS E. MURRAY, J R.

with the corrugated sheets and by the com-' paratively short interval between these points that extremely thin tubing can be used.

Another advantage of copperfor the tubing is its high resistance to corrosion. compared with other metals. ,Aluminum, for example" must be better than 99.9 percent. are

to be sure, to resist corrosion byflsteam. 2 ompounds that are used forcleanin -;tubes of Y boilers and similar apparatusfl'a souattack aluminum readily and seem to have no effeet on copper.

Steel is peculiarly useful for be cause compared with either aluminum or copper, it-presents greater stifiness'and greater capability of making good welds. Each of these three materials is especially suited,- therefore, to. contribute to the making of a radiator off-highefii'ciency of small sizeper given dutyand of. the lightest weight, without sacrifice of; strength; Y r Various. modifications may be made by those skilled in theart. without departing from the'inventionas defined in the appended claims. r

What I-claim is: 1.- A radiator consisting of'a tube for carrying the heating medium and sheet metal .fins in heat conducting-"contact therewith and formingpassages for the heated air, said tube being of comparatively thin flexible cuprousmetal and said fins being of c0m-' paratively thin flexible aluminous metal, and straps on the outside of portions of the fins at opposite sides of the tube fastened together so as to hold the fins in contact with the tube, said straps being of comparatively thick stifi' ferrous metal. i i

2. A radiator consisting of a tube for carthe. heating medium and sheet metal fins in heat conducting contact therewith and forming passages for the heated air, said tube being of cuprous metal and said fins being of aluminous metal, and straps on the outside of portions of the fins at opposite sides of the tube fastened together so as to-hold the fins. in contact with the tube, said straps being of ferrous metal fastened to each other by welded connections.

3. A radiator consisting of a heating element and sheet metal fins in heat conducting contact therewith and forming passages for the heated air, said fins being of aluminous 

